/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
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 */

#include <tools/unqidx.hxx>

UniqueIndexImpl::Index UniqueIndexImpl::Insert( void* p )
{
    // NULL-Pointer not allowed
    if ( !p )
        return IndexNotFound;

    // Insert the pointer, starting from the current nUniqIndex "hint"
    // and increasing it until a free one is found (this may happen
    // after removals followed by multiple insertions).
    while ( !maMap.emplace(nUniqIndex, p).second )
        ++nUniqIndex;

    // Take care of updating hint key for next insertion
    return nUniqIndex++;
}

void* UniqueIndexImpl::Remove( Index nIndex )
{
    std::map<Index, void*>::iterator it = maMap.find( nIndex );
    if ( it != maMap.end() )
    {
        // Allow to recycle freed indexes, as was done by
        // original implementation based on a vector
        // This is not really needed when using a map, and
        // really unique indexes might be better/safer?
        if ( nIndex < nUniqIndex )
            nUniqIndex = nIndex;

        void* p = it->second;
        maMap.erase( it );
        return p;
    }
    return nullptr;
}

void* UniqueIndexImpl::Get( Index nIndex ) const
{
    std::map<Index, void*>::const_iterator it = maMap.find( nIndex );
    if ( it != maMap.end() )
        return it->second;
    return nullptr;
}

UniqueIndexImpl::Index UniqueIndexImpl::FirstIndex() const
{
    if ( maMap.empty() )
        return IndexNotFound;

    return maMap.begin()->first;
}

UniqueIndexImpl::Index UniqueIndexImpl::LastIndex() const
{
    if ( maMap.empty() )
        return IndexNotFound;

    return maMap.rbegin()->first;
}

UniqueIndexImpl::Index UniqueIndexImpl::NextIndex(Index aIndex) const
{
    std::map<Index, void*>::const_iterator it = maMap.find( aIndex );
    if ( it == maMap.end() )
        return IndexNotFound;
    ++it;
    if ( it == maMap.end() )
        return IndexNotFound;
    return it->first;
}

UniqueIndexImpl::Index UniqueIndexImpl::GetIndexOf(void* p) const
{
    for( std::map<Index, void*>::const_iterator it = maMap.begin(); it != maMap.end(); ++it )
        if( it->second == p )
            return it->first;
    return IndexNotFound;
}

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